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BANGKOK 20 May 2019 06:04
gunderhill

Cutting steel roof panels

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Im putting a  roof  on my  garage using bluescope  steel panels however the morons i ordered from have made it 9cm too  long currently arguing with them  to change it  all or  cut  it, if  it all fails can and angle grinder with METAL  cutting discs be used (not the saw type  blades), I  know tin snips are  used but this is 16  panels 900mm wide with the corrugations in maybe ok for an expert but this stuff has a  guarantee and it may be voided by Bluescope.

I saw some folk say you shouldnt use some types of  discs I diamond etc

There is an issue of rust and paint damage. Hopefully  the morons  will fix  this problem but  just in case.

This is the type of metal disc i mean or is  this a  no no ?

The stupidity here sometimes really gets to you, on their bill they even drew out the correct sizes and shape 4.96  m + another 20cm for the curve,  stuck it on the roof  today and the over hang is way too  much, pruning 9cm off one end ie the other end which is straight not curved would suffice, their delivery driver also hid  this damaged section in the sneaky git. You can see the dents where he rested it  on the metal bar on his  pick up. All else  fails will contact Bluescope  head  office as this stuff isnt like the cheaper Thai stuff

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Edited by gunderhill

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16 minutes ago, taninthai said:

To be honest it looks fine with that over hang,the bigger the overhang the better keeps sun of walls and is not dropping water to close to your wall line.

Except there is no support so first cat fight and big bend likely.  But that said it would not be hard to weld in a support rod.

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36 minutes ago, taninthai said:

To be honest it looks fine with that over hang,the bigger the overhang the better keeps sun of walls and is not dropping water to close to your wall line.

No it  falls  directly into a  massive concrete  gutter  system thats 1metre  wide in the ground for rainwater run off from the rest of the land, currently it will overshoot  this (stuck one panel on the roof  this  morning and turned  hose on full to simulate downpour) the curve should  start right at the end of the roof  beams which is as it was drawn by me and  written down with her diagram on order 4.96 metres  +20cm curved overhang to  fall directly into my concrete  gulley. heres  the  gulley it  will fall straight into the centre of  that and as mentioned the overhang is way too long now, strong winds and maybe off it  goes.

Curve should start at the end of the roof  steel as per  my arrow, the stupid thing is they drew it  all  out correclty at 4.96 metres + the curve section max 20cm see  last photo her drawing

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Edited by gunderhill

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Fair enough if you have gully on floor you want the water to hit that,,it’s a easy enough job to cut 9 cm of the straight end,if the shop values customers it should be no problem for them.

just out of interest how much you pay for them sheets,,doing some roofs myself just bought the cheap tin sheets got 21 lengths 4m by 900mm cost us 252 bht per sheet.

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12 minutes ago, taninthai said:

Fair enough if you have gully on floor you want the water to hit that,,it’s a easy enough job to cut 9 cm of the straight end,if the shop values customers it should be no problem for them.

just out of interest how much you pay for them sheets,,doing some roofs myself just bought the cheap tin sheets got 21 lengths 4m by 900mm cost us 252 bht per sheet.

781FA8B2-437E-4453-9739-BAC4F4DD30D3.jpeg

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price is  there  on  their  bill  photo  think  it  was 16  sheets  total 14588 baht = 933 baht a sheet, its painted and .35mm  thick I guess thats the thickness anyway.

Its  Bluescope steel, there is also some foam insulation stuck on,  more for noise insulation for me than insulation as ill insulate the garage roof  space with fibreglass anyway. Forgot it  includes  putting the curve in also

Edited by gunderhill
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I tried cutting mine with a grinder, found the grinder would jam, tin snips were much easier.

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Just now, vogie said:

I tried cutting mine with a grinder, found the grinder would jam, tin snips were much easier.

What type of  cutting wheel did you use?

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2 minutes ago, gunderhill said:

What type of  cutting wheel did you use?

Just a normal mini grinder with the 4" run of the mill steel disc, not too dissimilar from the one in the picture further up.

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1 minute ago, vogie said:

Just a normal mini grinder with the 4" run of the mill steel disc, not too dissimilar from the one in the picture further up.

Ah  Ok I saw some people using a toothed blade for  cutting steel, zipped right thru it.

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6 minutes ago, gunderhill said:

Bluescope steel, there is also some foam insulation stuck on,  more for noise insulation for me than insulation as ill insulate the garage roof  space with fibreglass anyway.

It helps greatly for rain noise and also keep temperature much lower in area below - changed from Polycarbonate to insulated sheets several years ago for open carport and the temperature is very noticeably lower in area below (and nothing but open roof about 4 meters high).  

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Yes ours is 0.23mm thick with no insulation ,ours is definately the cheap stuff😂😂😂

grinder should cut it just have to be gentle and take it slow.

image.jpg

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3 minutes ago, lopburi3 said:

It helps greatly for rain noise and also keep temperature much lower in area below - changed from Polycarbonate to insulated sheets several years ago for open carport and the temperature is very noticeably lower in area below (and nothing but open roof about 4 meters high).  

My main issue  was  noise, i wasnt worried about the insulating value much as ill stick 4  inch fibreglass behind the ceiling when I do it, just waiting to see what the co.says, already tried  telling us the 9cm over was normal and  said they told us this, honestly  cant make it  up, in which case every time you buy this stuff you must allow "conveniently the 9cm"  over for your roof.

Looks  pretty clear to me by her drawing 4.96 + a 20cm curve, either way the curve should start at 4.96

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6 minutes ago, taninthai said:

Yes ours is 0.23mm thick with no insulation ,ours is definately the cheap stuff😂😂😂

grinder should cut it just have to be gentle and take it slow.

image.jpg

Mines aluzinc steel with the epoxy or whatever paint on, I want  durability and even for me thats a bit too thin, i saw some .5mm thick but not  coloured.

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2 hours ago, gunderhill said:

Im putting a  roof  on my  garage using bluescope  steel panels however the morons i ordered from have made it 9cm too  long currently arguing with them  to change it  all or  cut  it, if  it all fails can and angle grinder with METAL  cutting discs be used (not the saw type  blades), I  know tin snips are  used but this is 16  panels 900mm wide with the corrugations in maybe ok for an expert but this stuff has a  guarantee and it may be voided by Bluescope.

I saw some folk say you shouldnt use some types of  discs I diamond etc

There is an issue of rust and paint damage. Hopefully  the morons  will fix  this problem but  just in case.

This is the type of metal disc i mean or is  this a  no no ?

The stupidity here sometimes really gets to you, on their bill they even drew out the correct sizes and shape 4.96  m + another 20cm for the curve,  stuck it on the roof  today and the over hang is way too  much, pruning 9cm off one end ie the other end which is straight not curved would suffice, their delivery driver also hid  this damaged section in the sneaky git. You can see the dents where he rested it  on the metal bar on his  pick up. All else  fails will contact Bluescope  head  office as this stuff isnt like the cheaper Thai stuff

If you use any grinding disc you have voided the guarantee. The hot sparks from the grinding process will impact the painted surface and provide rust nuclei. Bluescope state that using any grinder voids the guarantee.

 

The installers for our roof used snips with extended handles to cut our roof sheets to length. It is an easy modification for any competent welder.IMG_7399.thumb.PNG.9011058590504994799e7d930259912a.PNG

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